node_tile_server

This is an experimental node.js powered Quad Tile server written in CoffeeScript to render geo data from a postgres database.

Its purpose is to create map overlays in a convenient way using a server-side version of the HTML5 Canvas element.

It supports different tile modes:

• Rendering a heatmap overlay based on geo points.

• Rendering a very simple street map based on the OpenStreetMap schema.

It works very well with CloudMade's Leaflet map client - examples included.

But of course it also works with any other map client that supports overlays from a custom quad tile provider, like Google Maps or Bing Maps.

Rendering a Heatmap

Rendering OpenStreetMap Data

Super Sexy Heatmap with custom Cloudmade Tiles

Setup Guide for OSM Data

Note on rendering OpenStreetMap data: At the moment it doesn't really render much and it probably will never compete with other full sized map renderers like mapnik.

But you could use it e.g. to add a second tile layer to your map client and render some additional custom map features.

Requirements for OS X

• node.js
• npm
• homebrew
• Postgres and PostGIS
• Java (only for importing of osm files into db)

Part 1: Setting up an OpenStreetMap database with some example data

Install osmosis

brew install osmosis

Setup DB

CREATE DATABASE osm_node
  WITH ENCODING='UTF8'
       OWNER=YOUR_DB_USER
       TEMPLATE=template_postgis
       CONNECTION LIMIT=-1;

See: http://wiki.openstreetmap.org/wiki/Osmosis/PostGIS_Setup

Install HStore

psql -d osm_node -f /usr/local/Cellar/postgresql/9.0.3/share/contrib/hstore.sql

Load Osmosis Scripts

psql -d osm_node -f /usr/local/Cellar/osmosis/0.38/libexec/script/pgsql_simple_schema_0.6.sql

psql -d osm_node -f /usr/local/Cellar/osmosis/0.38/libexec/script/pgsql_simple_schema_0.6_linestring.sql

psql -d osm_node -f /usr/local/Cellar/osmosis/0.38/libexec/script/pgsql_simple_schema_0.6_bbox.sql

psql -d osm_node -f /usr/local/Cellar/osmosis/0.38/libexec/script/pgsql_simple_schema_0.6_action.sql

Load an osm file in DB

osmosis --read-xml file="/Users/fabrik42/Dev/node/postgis/osm/dieburg.osm" --write-pgsql user="YOUR_DB_USER" database="osm_node" password="YOUR_DB_PASSWORD"

Part 2: Starting the node.js Server

Install node.js dependencies

npm install

Create database config file

Create the file src/settings.coffee, based on src/settings_example.coffee

Build the lib

cake build

Run the server

node lib/server.js

Point your browser to

http://localhost:3000/osm_streets.html